Flash Flood Warning 56, NWS Salt Lake City, UT

272 
WGUS75 KSLC 231852
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1252 PM MDT FRI AUG 23 2013

UTC007-015-232000-
/O.CON.KSLC.FF.W.0056.000000T0000Z-130823T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
1252 PM MDT FRI AUG 23 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM MDT FOR 
NORTHWESTERN EMERY AND WEST CENTRAL CARBON COUNTIES...SPECIFICALLY 
THE SEELEY BURN SCAR AND HUNTINGTON CREEK...

AT 1230 PM MDT...OVER THE LAST 6 HOURS .57 INCHES OF RAIN HAS FALLEN 
ON THE SEELEY BURN SCAR. TRAINED WEATHER SPOTTERS HAVE INDICATED 
THAT DEBRIS AND RUNOFF FROM THE SEELEY BURN SCAR HAS FLOWED ONTO 
UTAH HIGHWAY 31...AND IS CURRENTLY IMPACTING THE HUNTINGTON POWER 
PLANT DOWNSTREAM OF THE SCAR. ADDITIONAL STORMS ARE EXPECTED TO 
IMPACT THE SEELEY BURN SCAR THROUGH 2 PM MDT THEREFORE THE FLASH 
FLOOD WARNING REMAINS IN EFFECT. 

THIS THUNDERSTORM WITH EXCESSIVE RAIN WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3951 11122 3960 11120 3963 11113 3947 11108
      3937 11103 3935 11112 3946 11118

$$

MERRILL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
511 AM MDT FRI AUG 23 2013

.SYNOPSIS...DEEP MOISTURE WILL DEVELOP SUNDAY INTO EARLY IN THE
WORK WEEK EXPANDING COVERAGE OF SHOWERS AND THUNDERSTORMS AND
LEADING TO COOLER TEMPERATURES ACROSS THE REGION.

&&

.DISCUSSION...HIGH PRESSURE IS CENTERED OVER THE OKLAHOMA PANHANDLE
THIS MORNING WHILE THE REMNANTS OF THE UPPER LOW THAT WAS SITTING
OFF THE CALIFORNIA COAST LIFTS NORTHEAST ACROSS THE PACIFIC
NORTHWEST STATES. A COUPLE OF SHORTWAVE DISTURBANCES EMBEDDED IN THE
STILL-MOIST SOUTH-SOUTHWEST FLOW KEPT CONVECTION ACTIVE
OVERNIGHT...WITH A FEW LINGERING SHOWERS CONTINUING ACROSS
NORTH-CENTRAL AND NORTHEAST UTAH WHILE STRONGER STORMS HAVE SPREAD
INTO SOUTHERN UTAH FROM ARIZONA. EXPECT SOUTHERN UTAH TO BE THE MAIN
FOCUS FOR CONVECTION THIS MORNING THROUGH EARLY AFTERNOON...WITH
ACTIVITY SHIFTING NORTHWARD LATER IN THE DAY AS THE ASSOCIATED
SHORTWAVE LIFTS NORTH. CONVECTION LOOKS TO CONTINUE THROUGH THE
OVERNIGHT HOURS MAINLY ACROSS NORTHERN UTAH.

THE AIRMASS IS STILL PROGGED TO TREND DRIER FROM THE WEST
TOMORROW. HOWEVER...WITH ABUNDANT MOISTURE IN PLACE
CURRENTLY...THIS SUBTLE DRYING WILL STILL LEAVE ENOUGH MOISTURE TO
GENERATE SCATTERED CONVECTION TOMORROW...MAINLY ACROSS THE MOUNTAINS
AND EAST.

THE DRYING TREND WILL BE RATHER BRIEF AS MODELS STILL INSIST ON
TAPPING A PLUME OF DEEP MOISTURE FROM A DECAYING TROPICAL SYSTEM
OVER THE BAJA COAST. THIS WILL OCCUR AS SOUTHERLY FLOW INCREASES
AHEAD OF AN UPPER TROUGH APPROACHING THE WEST COAST SATURDAY NIGHT.
THE MOISTURE IS EXPECTED TO MAKE ITS WAY INTO SOUTHERN AND CENTRAL
UTAH ON SUNDAY. MODELS STILL INDICATE PRECIPITABLE WATER VALUES WELL
OVER AN INCH ACROSS MUCH OF SOUTHERN AND CENTRAL UTAH BY SUNDAY
AFTERNOON. WITH THE ADDITION OF LARGE-SCALE LIFT AHEAD OF THE
AFOREMENTIONED TROUGH...EXPECT WIDESPREAD PRECIPITATION WITH SOME
EMBEDDED THUNDERSTORMS. GIVEN THE SIGNIFICANT CLOUD COVER THAT WILL
ACCOMPANY THIS MOISTURE PLUME...THE POTENTIAL FOR DEEP CONVECTION
MAY NOT BE ALL THAT SIGNIFICANT. HOWEVER...WIDESPREAD LIGHT TO
MODERATE RAIN COULD STILL PRESENT HYDROLOGIC ISSUES IN SENSITIVE
AREAS SUCH AS BURN SCARS.

THE MOISTURE LOOKS TO LINGER INTO TUESDAY BEFORE THE AIRMASS STARTS
DRYING SLOWLY FROM THE WEST. AS A RESULT...EXPECT SCATTERED TO
NUMEROUS SHOWERS AND THUNDERSTORMS TO PERSIST...STILL MAINLY ACROSS
SOUTHERN AND CENTRAL UTAH...DURING THIS TIMEFRAME. IN ADDITION...THE
RAIN AND CLOUD COVER SHOULD BRING A COOLING TREND TO THIS AREA AS
WELL. THE DRIER AIR WILL THEN CONTINUE TO WORK INTO THE AREA THROUGH
THE LATTER PART OF THE WEEK...WITH MOISTURE BEING SHUNTED INTO THE
EASTERN PORTIONS OF THE AREA BUT NOT COMPLETELY DRYING OUT ENOUGH TO
KEEP THE THREAT OF SHOWERS AT BAY.

&&

.AVIATION...SHOWERS AND THUNDERSTORMS WILL ONCE AGAIN FORM ACROSS
NORTHERN UTAH TODAY...WITH A 40 PERCENT CHANCE THAT STORMS WILL
IMPACT THE SLC TERMINAL. APART FROM SHOWERS...SURFACE WINDS AT THE
TERMINAL ARE EXPECTED TO REMAIN SOUTHERLY THROUGH THE DAY...WITH
ONLY A SLIGHT CHANCE THAT WINDS SWITCH TO THE NORTHWEST DUE TO A
LAKE BREEZE SOMETIME THIS AFTERNOON.

&&

.FIRE WEATHER...SHOWERS AND THUNDERSTORMS ARE STILL ONGOING ACROSS
PARTS OF UTAH THIS MORNING...PARTICULARLY IN SOUTHERN UTAH...AND
COVERAGE OF STORMS WILL INCREASE THROUGH THE AFTERNOON. THIS
MOISTURE AND POTENTIAL FOR SHOWERS WILL LINGER INTO SATURDAY AS
WELL. GUSTY SOUTHERLY WINDS WILL ALSO BE POSSIBLE BOTH TODAY AND
TOMORROW...AS A LOW PRESSURE SYSTEM PASSES NORTH OF THE AREA.
NORTHWEST UTAH MAY BE DRY ENOUGH DURING THIS PERIOD TO ALLOW FOR
ISOLATED CRITICAL CONDITIONS...BUT WIDESPREAD CRITICAL CONDITIONS
ARE NOT EXPECTED AT THIS TIME.

EVEN DEEPER MOISTURE IS EXPECTED TO MOVE INTO UTAH FROM THE SOUTH
BEGINNING SUNDAY. THIS WILL INCREASE THE THREAT OF WETTING RAINS
THROUGH THE FIRST HALF OF NEXT WEEK...AND KEEP RELATIVE HUMIDITY
VALUES SOMEWHAT HIGH IN MOST LOCATIONS.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...NONE.
WY...NONE.
&&

CHENG/SCHOENING

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION
VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP (ALL LOWER CASE)

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
530 AM MDT FRI AUG 23 2013

UTZ001>016-019>021-517-518-WYZ021-241200-
CACHE VALLEY/UTAH PORTION-NORTHERN WASATCH FRONT-
SALT LAKE AND TOOELE VALLEYS-SOUTHERN WASATCH FRONT-
GREAT SALT LAKE DESERT AND MOUNTAINS-WASATCH MOUNTAIN VALLEYS-
WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80-
WESTERN UINTA MOUNTAINS-WASATCH PLATEAU/BOOK CLIFFS-
WESTERN UINTA BASIN-CASTLE COUNTRY-SAN RAFAEL SWELL-
SANPETE/SEVIER VALLEYS-WEST CENTRAL UTAH-SOUTHWEST UTAH-
UTAHS DIXIE AND ZION NATIONAL PARK-SOUTH CENTRAL UTAH-
GLEN CANYON RECREATION AREA/LAKE POWELL-CENTRAL MOUNTAINS-
SOUTHERN MOUNTAINS-SOUTHWEST WYOMING-
530 AM MDT FRI AUG 23 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF
UTAH AND SOUTHWEST WYOMING.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS MOST OF THE OUTLOOK
AREA TODAY THROUGH TONIGHT. THUNDERSTORMS WILL BE FOCUSED MORE
ACROSS THE SOUTH DURING THE EARLY PART OF THE DAY...THEN SHIFT
NORTHWARD LATE THIS AFTERNOON INTO THIS EVENING. SOME OF THESE
STORMS WILL PRODUCE LOCALLY HEAVY RAIN AND GUSTY WINDS. ISOLATED
FLASH FLOODING IS POSSIBLE IN BURN SCARS AND THE MORE PRONE DRY
WASHES AND SLOT CANYONS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A SOMEWHAT DRIER AIRMASS WILL SPREAD INTO THE AREA ON SATURDAY.
ALTHOUGH SHOWERS AND THUNDERSTORMS ARE STILL EXPECTED TO
DEVELOP...THEY WILL BE REDUCED IN AREAL COVERAGE AND THE THREAT OF
HEAVY RAIN WILL BE A BIT LESS.

DEEP MOISTURE IS EXPECTED TO MOVE BACK INTO THE AREA STARTING
SUNDAY AND REMAIN THROUGH EARLY NEXT WEEK. THIS WILL BRING ANOTHER
INCREASE IN PRECIPITATION AND THE POSSIBILITY OF LOCALIZED FLASH
FLOODING.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

FOR INFORMATION ON POTENTIAL TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
514 AM MDT FRI AUG 23 2013

UTZ001>016-019>021-517-518-WYZ021-232300-
CACHE VALLEY/UTAH PORTION-NORTHERN WASATCH FRONT-
SALT LAKE AND TOOELE VALLEYS-SOUTHERN WASATCH FRONT-
GREAT SALT LAKE DESERT AND MOUNTAINS-WASATCH MOUNTAIN VALLEYS-
WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80-
WESTERN UINTA MOUNTAINS-WASATCH PLATEAU/BOOK CLIFFS-
WESTERN UINTA BASIN-CASTLE COUNTRY-SAN RAFAEL SWELL-
SANPETE/SEVIER VALLEYS-WEST CENTRAL UTAH-SOUTHWEST UTAH-
UTAHS DIXIE AND ZION NATIONAL PARK-SOUTH CENTRAL UTAH-
GLEN CANYON RECREATION AREA/LAKE POWELL-CENTRAL MOUNTAINS-
SOUTHERN MOUNTAINS-SOUTHWEST WYOMING-
514 AM MDT FRI AUG 23 2013

...COOLER AND WETTER WEATHER COMING TO CENTRAL AND SOUTHERN UTAH...

SIGNIFICANT MOISTURE WILL SPREAD INTO THE CENTRAL AND SOUTHERN
PORTIONS OF THE STATE SUNDAY INTO EARLY NEXT WEEK BRINGING THE
POTENTIAL FOR WIDESPREAD RAIN TO THE AREA. IN ADDITION TO THE
RAIN...SIGNIFICANTLY COOLER TEMPERATURES ARE EXPECTED WITH
TEMPERATURES FALLING 10 DEGREES BELOW FRIDAYS READINGS BY SUNDAY.

DEPENDING ON HOW THIS SYSTEM EVOLVES...THERE MAY BE THE POTENTIAL
FOR LOCALIZED FLASH FLOODING WITH THE RAINFALL SUNDAY INTO MONDAY.
ANYONE LIVING IN OR TRAVELING TO CENTRAL AND SOUTHERN UTAH DURING
THIS PERIOD SHOULD CONTINUE TO MONITOR FUTURE FORECASTS OVER THE
NEXT SEVERAL DAYS.

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

FOR INFORMATION ON POTENTIAL TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX